KTKX (106.7 FM "106.7 The Eagle") is a commercial radio station, licensed to Terrell Hills, Texas, and serving the San Antonio metropolitan area. KTKX is owned by Cox Radio, positioned between two other Cox stations. KTKX has a pop-leaning classic rock radio format, while sister stations KISS-FM airs an active rock format with some harder-edged classic rock titles, and KONO-FM plays classic hits, including some classic rock songs that also scored on the Top 40 charts. KTKX's studios and offices are located on Datapoint Drive in Northwest San Antonio near the South Texas Medical Center complex. The transmitter site is off Hallmark Path in southern Bexar County. KTKX has an effective radiated power (ERP) of 100,000 watts, and broadcasts in the HD Radio format. History 106.3 KTUF and KESI Before 1979, KBUC-FM (now KVBH) was heard on 106.3 in the San Antonio radio market. In 1979, it moved to 107.5, clearing the way for a new station to go on the air at 106.3. KTUF signed on the air on July 18, 1979. It was San Antonio's first commercial FM radio station with a jazz format. KTUF was the FM counterpart to KAPE (now KCHL), with both stations owned by the Southern Sound System Broadcasting Company. KTUF broadcast at only 3,000 watts, because 106.3 FM was originally a Class A frequency, reserved for lower-powered stations. In 1982, the station was acquired by S.I.T. Broadcasting. The following year, the format changed to album rock with the station taking the KESI call sign. It would then flip to easy listening music, followed by an adult contemporary music format known as "Star 106." Ratings on all of these formats underperformed, in part due to the station's low power. Move to 106.7 In 1986, KESI switched frequencies from 106.3 to 106.7 FM. Moving to 106.7 was coupled with a big boost in power, going to 100,000 watts. The next year, KESI switched call letters to KMMX, becoming "K-Mix 106.7". The AC format would remain intact for several more years. In November 1992, KMMX flipped to a simulcast of country-formatted KKYX, with a change in call signs to KKYX-FM. The flip gave San Antonio three full power FM country stations, with KAJA and KCYY playing mostly contemporary country hits, while KKYX-AM-FM leaned toward classic country. The simulcast ended the following year, just in time for the 1993 San Antonio Stock Show & Rodeo. KKYX-FM switched